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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 919 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Round 26.37 to one decimal place. =
  2. 2.Which is closest to 1991 ÷ 39? (a) 25 (b) 100 (c) 50 (d) 500
  3. 3.Which is closest to 704 × 29? (Round each number first.) (a) 2100 (b) 210000 (c) 21000 (d) 42000
  4. 4.Round 5717 to the nearest ten.
  5. 5.Round 45.11 to one decimal place. =
  6. 6.Round 52488 to the nearest hundred.
  7. 7.Which is closest to 597 × 91? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  8. 8.Round 18052 to the nearest thousand.
  9. 9.Which is closest to 101 + 102 + 602? (a) 900 (b) 1000 (c) 700 (d) 800
  10. 10.Which is closest to 896 × 51? (Round each number first.) (a) 45000 (b) 450000 (c) 90000 (d) 4500
  11. 11.Which is closest to 1994 ÷ 39? (a) 25 (b) 50 (c) 500 (d) 100
  12. 12.Round 57.87 to one decimal place. =
  13. 13.Which is closest to 604 × 21? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  14. 14.Which is closest to 1591 ÷ 41? (a) 80 (b) 20 (c) 40 (d) 400
  15. 15.Round 89.32 to one decimal place. =
  16. 16.Round 12538 to the nearest ten.
  17. 17.Which is closest to 999 ÷ 21? (a) 50 (b) 500 (c) 25 (d) 100
  18. 18.Round 22419 to the nearest ten.
  19. 19.Round 7307 to the nearest thousand.
  20. 20.Round 64929 to the nearest thousand.
  21. 21.Which is closest to 902 × 32? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  22. 22.Which is closest to 596 + 598 + 101? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  23. 23.Round 33.19 to one decimal place. =
  24. 24.Which is closest to 398 × 20? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
  25. 25.Which is closest to 604 + 105 + 97? (a) 800 (b) 700 (c) 900 (d) 1000
  26. 26.Round 33518 to the nearest hundred.
  27. 27.Which is closest to 1496 ÷ 31? (a) 100 (b) 500 (c) 25 (d) 50
  28. 28.Round 70.68 to one decimal place. =
  29. 29.Which is closest to 805 + 698 + 296? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  30. 30.Which is closest to 396 × 69? (Round each number first.) (a) 2800 (b) 280000 (c) 56000 (d) 28000
  31. 31.Round 82318 to the nearest ten.
  32. 32.Which is closest to 103 + 401 + 300? (a) 1000 (b) 700 (c) 900 (d) 800
  33. 33.Which is closest to 903 × 48? (Round each number first.) (a) 450000 (b) 4500 (c) 45000 (d) 90000
  34. 34.Which is closest to 199 × 19? (Round each number first.) (a) 40000 (b) 8000 (c) 4000 (d) 400
  35. 35.Which is closest to 496 + 702 + 96? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  36. 36.Round 45.92 to one decimal place. =
  37. 37.Which is closest to 803 × 18? (Round each number first.) (a) 16000 (b) 1600 (c) 32000 (d) 160000
  38. 38.Round 63.11 to one decimal place. =
  39. 39.Which is closest to 99 + 302 + 799? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  40. 40.Round 23419 to the nearest ten.

Answer key

  1. 26.4
  2. 50
  3. 21000
  4. 5720
  5. 45.1
  6. 52500
  7. 54000
  8. 18000
  9. 800
  10. 45000
  11. 50
  12. 57.9
  13. 12000
  14. 40
  15. 89.3
  16. 12540
  17. 50
  18. 22420
  19. 7000
  20. 65000
  21. 27000
  22. 1300
  23. 33.2
  24. 8000
  25. 800
  26. 33500
  27. 50
  28. 70.7
  29. 1800
  30. 28000
  31. 82320
  32. 800
  33. 45000
  34. 4000
  35. 1300
  36. 45.9
  37. 16000
  38. 63.1
  39. 1200
  40. 23420

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